440 Comparison of Two Methods for Shear Bond Strength Testing

Thursday, March 22, 2012: 3:30 p.m. - 4:45 p.m.
Presentation Type: Poster Session
K. BRASWELL1, E. SWIFT1, and R. WALTER2, 1UNC Chapel Hill, Chapel Hill, NC, 2University of Pennsylvania, Philadelphia, PA
Objectives: The purpose of this study was to compare shear bond strengths of a single adhesive system determined using the UltraTester (Ultradent, Inc.) device and a more traditional testing device (Instron model 4411, crosshead speed 1 mm/min).  

Methods: Human and bovine enamel and dentin were polished to 600-grit.  Surfaces were treated using Clearfil SE Bond self-etch primer and adhesive.  Flowable composite was applied to the treated tooth surfaces using the standard Ultradent specimen former.  Bonded specimens were stored in water for 24 hours at 37°C, and shear bond strength testing was done using either the Instron or the UltraTester.  Specimen number = 6 for each group as defined by the three independent variables: (type of tooth, substrate, and test device).  Data were analyzed using three-way analysis of variance (ANOVA; alpha = .05). 

Results:  Mean SBS values (MPa ±SD) are summarized in the table.  None of the independent variables had a statistically significant effect on bond strength.







27.3 (8.1)

26.0 (5.1)



29.1 (6.9)

29.6 (6.7)



29.1 (8.0)

27.0 (7.6)



26.5 (7.6)

31.5 (5.7)

Conclusions: Shear bond strengths determined by the two different testing methods were similar regardless of tooth and substrate type.

Keywords: Adhesion, Dental materials, Dentin bonding agents and Methodology